Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5a9e8544e5f7d9…

MALICIOUS

PDF

95.2 KB Created: 2021-06-07 13:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3a357ca80526684329f5892f2c03375d SHA-1: c8d5cda0c83f61d3dd6d14230b7ae96c889a7eb7 SHA-256: 8e5a9e8544e5f7d9d44b9fd365a7ba257e2f01c05aaa0f0745ecbf0dacf9c5b1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous URLs and the heuristic firings point to an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://queure.ru/pbw?utm_term=susan+sontag+silence+pdf PDF link annotation
    • https://luvinazomefad.weebly.com/uploads/1/3/4/3/134308035/kojexe_duwojomapasume_vigozamoso_rezoxokaluke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450512/normal_601a799bea80a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408475/normal_60688d491449d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454973/normal_606e45877e0ba.pdfIn PDF document text
    • https://tumizoma.weebly.com/uploads/1/3/2/8/132814974/0d819b908f.pdfIn PDF document text
    • https://zuwubusonelab.weebly.com/uploads/1/3/0/7/130739898/628430cab1af4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/940f44e2-4929-4b8f-8634-89866cb99ddd/1514232323.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54d2219a-8d6d-431a-8c0e-70f4e2c9e1e8/paul_rand_and_corporate_identity_systems.pdfIn PDF document text
    • http://tosuvop.pbworks.com/w/file/fetch/144467883/who_scribed_the_treaty_of_hudaibiyah.pdfIn PDF document text
    • http://mituxap.pbworks.com/f/lirik_lagu_lady_gaga_ft_bradley_cooper_shallows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79f64769-5275-493c-8a96-6f98a63e332d/how_to_use_icolor_hair_dye_shampoo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd00b78f-c3d5-421f-b97b-be28dc022e6a/survival_food_bucket_wise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/373f3ac2-bcd1-4710-9f17-3410d5c5006f/nozut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cceeeac9-4cb3-4b44-bcb3-4f941c15fd4e/zotonetizekofijagusan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4fbc4a8-0a74-4d88-95f3-b5f3c40ea8c0/30729710493.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/579cba38-5c37-4608-9259-7e0c056ae217/nupubow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/081ef413-40f7-4e49-b78a-ec7ba9391251/dopowafozaxinezixevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3965fe7-dd10-4673-8f02-70ca24df5505/64482701083.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ba525ad-6cea-421c-a3b5-b978840001cf/tadakukanulozatoju.pdfIn PDF document text
    • http://xodelow.pbworks.com/w/file/fetch/144451701/begezajaba.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13789 5332 bytes
SHA-256: 7fa433fd4c2239699512227b9fee16311f7b7ff338b2e2dcc11dda93876a5976
font_01_sfnt_off000149c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C1 10820 bytes
SHA-256: 8da4a246a3814f536ae35f865bca5d031d7500a01233b5b1d358279532e9c1cd